I have a T420 retrofitted with a T430-keyboard/trackpoint that I really like (especially with classic dome).
So, I got a T430s as a backup, since it has the same keyboard and supports classic domes.

Well... everything works, BUT the scrolling with Mid-button+Trackpoint is NOT as smooth as on the other T430-keyboard ("jerky").
Is this a hardware issue on the 430s (vs 430)? Or a Win10-issue?
(I've read that there were different manufacturers of this keyboard)

PS: I have installed the latest Synaptic Trackpoint + Intel graphics drivers
PPS: The T420 also has Intel graphics

It seems this is a Win10-issue. Scrolling with Mid-button is much better on Win8.1 and Linux Mint.
Seems that the older driver for Win7/8/8.1 just is better.
This is really a pity. Does anyone know why they had to make a new trackpoint-driver, just for Win10?